Heteromysis (Heteromysis) S. I. Smith, 1873

Daneliya, Mikhail E., 2021, On the Mysid Crustacean Genus Heteromysis (Mysidae: Heteromysinae) of the Tasman Sea, with Notes on the Tribe Heteromysini, Records of the Australian Museum (Rec. Aust. Mus.) 73 (1), pp. 1-50 : 8

Heteromysis (Heteromysis) S. I. Smith, 1873

Heteromysis (Heteromysis) .— Băcescu, 1968: 234−237; 1979: 145.— Bravo & Murano, 1996: 483.— Price & Heard, 2000: 88, 92, 93.— Wittmann, 2000: 287; 2001: 94, 104; 2008: 368; 2020: 142, 154.— Wittmann & Wirtz, 2017: 149.— Wittmann & Griffiths, 2017: 17, 39−40.— Hanamura & Kase, 2001a: 17.— Daneliya, 2012: 146.— Hanamura et al., 2012: 17.— San Vicente & Monniot, 2014: 340.—Levesque et al., 2016: 2.

Type species. Heteromysis formosa S. I. Smith, 1873 .

Diagnosis. Ischium of pereopod 1 endopod two to three times as long as wide; medially without denticles. Pleopods unmodified, setose in both sexes. Uropodal endopod shorter than exopod.

Comparison. The subgenus Heteromysis (Heteromysis) as currently composed does not have unique characters common to all its members, representing a heterogeneous group. Its members are distinguished from the species of the subgenus Heteromysis (Gnathomysis) by the smooth and narrow ischium of pereopod 1 endopod (nearly as long as wide, with denticles in Gnathomysis ), and by the uropodal endopods being shorter than exopods (equal or slightly longer in Gnathomysis ). From the members of the subgenus Heteromysis (Olivemysis) the species of Heteromysis s. str. are distinguished by non-modified pleopods.

Remarks. Băcescu (1968) designated the subgenus Heteromysis s. str., based on absence of the pleopod modifications. This has remained the only reason, by which newly described species not fitting into the other known Heteromysis subgenera, have been included in the nominotypical subgenus ( Wittmann & Griffiths, 2017).

I have attempted, in addition to the study of the Tasman Sea species, to compare all known Heteromysis from the available literature. A number of rather clearly defined groups can be established within the subgenus. However, because of insufficient descriptions and illustrations, some species remain incertae sedis, and the taxonomic status of such groups can be clarified only after the study of actual material. Meanwhile, it is possible to define one such group, which includes all the Tasman Sea species, and which I call the microps -group.

Composition. The nominate subgenus of Heteromysis currently contains 31 species, among which four species can be found in the Tasman Sea: Heteromysis (H.) communis Băcescu, 1986 , Heteromysis (H.) macropsis Pillai, 1961 , Heteromysis (H.) keablei sp. nov., Heteromysis (H.) tasmanica .